From: Baihan Li <libai...@huawei.com>
If DP is connected, check the DP BW in mode_valid_ctx() to ensure
that DP's link rate supports high-resolution data transmission.
Fixes: 0ab6ea261c1f ("drm/hisilicon/hibmc: add dp module in hibmc")
Signed-off-by: Baihan Li <libai...@huawei.com>
Signed-off-by: Yongbang Shi <shiyongb...@huawei.com>
Reviewed-by: Dmitry Baryshkov <dmitry.barysh...@oss.qualcomm.com>
---
ChangeLog:
v4 -> v5:
- fix bugfix commit ID, suggested by Dmitry Baryshkov.
---
.../gpu/drm/hisilicon/hibmc/dp/dp_config.h | 2 ++
drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.c | 10 ++++++++++
drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.h | 2 ++
.../gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c | 19 +++++++++++++++++++
4 files changed, 33 insertions(+)
diff --git a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_config.h
b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_config.h
index 08f9e1caf7fc..efb30a758475 100644
--- a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_config.h
+++ b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_config.h
@@ -17,5 +17,7 @@
#define HIBMC_DP_LINK_RATE_CAL 27
#define HIBMC_DP_SYNC_DELAY(lanes) ((lanes) == 0x2 ? 86 : 46)
#define HIBMC_DP_INT_ENABLE 0xc
+/* HIBMC_DP_LINK_RATE_CAL * 10000 * 80% = 216000 */
+#define DP_MODE_VALI_CAL 216000
#endif
diff --git a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.c
b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.c
index 8f0daec7d174..f8e1b437c385 100644
--- a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.c
+++ b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.c
@@ -263,6 +263,16 @@ void hibmc_dp_reset_link(struct hibmc_dp *dp)
dp->dp_dev->link.status.channel_equalized = false;
}
+u8 hibmc_dp_get_link_rate(struct hibmc_dp *dp)
+{
+ return dp->dp_dev->link.cap.link_rate;
+}
+
+u8 hibmc_dp_get_lanes(struct hibmc_dp *dp)
+{
+ return dp->dp_dev->link.cap.lanes;
+}
+
static const struct hibmc_dp_color_raw g_rgb_raw[] = {
{CBAR_COLOR_BAR, 0x000, 0x000, 0x000},
{CBAR_WHITE, 0xfff, 0xfff, 0xfff},
diff --git a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.h
b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.h
index 665f5b166dfb..312cf7920037 100644
--- a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.h
+++ b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.h
@@ -60,5 +60,7 @@ void hibmc_dp_reset_link(struct hibmc_dp *dp);
void hibmc_dp_hpd_cfg(struct hibmc_dp *dp);
void hibmc_dp_enable_int(struct hibmc_dp *dp);
void hibmc_dp_disable_int(struct hibmc_dp *dp);
+u8 hibmc_dp_get_link_rate(struct hibmc_dp *dp);
+u8 hibmc_dp_get_lanes(struct hibmc_dp *dp);
#endif
diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c
b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c
index 123372ae2d40..d0d0900121df 100644
--- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c
+++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c
@@ -13,6 +13,7 @@
#include "hibmc_drm_drv.h"
#include "dp/dp_hw.h"
#include "dp/dp_comm.h"
+#include "dp/dp_config.h"
#define DP_MASKED_SINK_HPD_PLUG_INT BIT(2)
@@ -49,9 +50,27 @@ static int hibmc_dp_detect(struct drm_connector *connector,
return drm_connector_helper_detect_from_ddc(connector, ctx, force);
}
+static int hibmc_dp_mode_valid(struct drm_connector *connector,
+ const struct drm_display_mode *mode,
+ struct drm_modeset_acquire_ctx *ctx,
+ enum drm_mode_status *status)
+{
+ struct hibmc_dp *dp = to_hibmc_dp(connector);
+ u64 cur_val, max_val;
+
+ /* check DP link BW */
+ cur_val = (u64)mode->clock * HIBMC_DP_BPP;
+ max_val = (u64)hibmc_dp_get_link_rate(dp) * DP_MODE_VALI_CAL *
hibmc_dp_get_lanes(dp);
+
+ *status = cur_val > max_val ? MODE_CLOCK_HIGH : MODE_OK;
+
+ return 0;
+}
+
static const struct drm_connector_helper_funcs hibmc_dp_conn_helper_funcs = {
.get_modes = hibmc_dp_connector_get_modes,
.detect_ctx = hibmc_dp_detect,
+ .mode_valid_ctx = hibmc_dp_mode_valid,
};
static int hibmc_dp_late_register(struct drm_connector *connector)
--
2.33.0
